import {onMounted, ref} from "vue";

export default function(){
    let sum = ref(0)

    const increment = ()=>{
        sum.value += 1
    }
    const decrement = ()=>{
        sum.value -= 1
    }
    onMounted(()=>{
        increment()
    })

    //向外部暴露数据
    return {sum,increment,decrement}
}